add times and refactor folder structure

times/gpu-opt/opt.out

@@ -0,0 +1,20 @@
+type,arg,nrels,secs,cosets
+0,25,4,0.38605,2500
+0,50,4,1.6768,10000
+0,75,4,7.64476,22500
+0,100,4,19.5545,40000
+0,125,4,44.443,62500
+0,150,4,82.011,90000
+0,175,4,124.86,122500
+0,200,4,174.554,160000
+0,225,4,230.284,202500
+0,250,4,288.602,250000
+5,2,2,0.00299317,8
+5,3,3,0.00585187,48
+5,4,4,0.0421133,384
+5,5,5,0.439017,3840
+1,-1,4,1.63292,14400
+5,6,6,14.8635,46080
+2,-1,6,17.6105,51840
+5,7,7,734.339,645120
+3,-1,7,6729.78,2903040